package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {
    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 新增套餐 同时需要保存套餐和菜品的关联关系
     *
     * @param setmealDto
     */
    @Override
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        // 保存套餐的基本信息 操作 setmeal 执行insert 操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();

        setmealDishes = setmealDishes.stream().peek((item) -> {
            item.setSetmealId(setmealDto.getId());
        }).collect(Collectors.toList());

        // 保存套餐和菜品的关联信息 操作 setmal_dish 执行 insert 操作
        setmealDishService.saveBatch(setmealDishes);


    }

    /**
     * 删除套餐 同时删除套餐和菜品的关联数据
     * Transactional 多表操作务必开启事物
     *
     * @param ids
     */
    @Override
    @Transactional
    public void removeWithDish(List<Long> ids) {
        // 查询套餐状态 , 确定是否可以删除
        LambdaQueryWrapper<Setmeal> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(Setmeal::getId, ids);
        lambdaQueryWrapper.eq(Setmeal::getStatus, 1);
        long count = this.count(lambdaQueryWrapper);
        if (count > 0) {
            // 如果不能删除 抛出一个业务异常
            throw new CustomException("套餐正在售卖中,不能删除");
        }


        // 如果可以 先删除套餐表中的数据 -- setmeal
        this.removeByIds(ids);

        // 再删除关系表中的数据 setmeal_dish
        LambdaQueryWrapper<SetmealDish> setmealDishLqw = new LambdaQueryWrapper<>();
        setmealDishLqw.in(SetmealDish::getSetmealId, ids);

        setmealDishService.remove(setmealDishLqw);

    }

    /**
     * 根据id 查询套餐信息和菜品信息
     * 多表查询一般不需要开启事物
     *
     * @param id
     * @return
     */
    @Override
    public SetmealDto getByIdWithDish(Long id) {
        Setmeal setmeal = this.getById(id);
        SetmealDto setmealDto = new SetmealDto();
        // copy
        BeanUtils.copyProperties(setmeal, setmealDto);

        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(SetmealDish::getSetmealId, setmeal.getId());
        List<SetmealDish> list = setmealDishService.list(lambdaQueryWrapper);

        setmealDto.setSetmealDishes(list);

        return setmealDto;
    }

    /**
     * 更新套餐信息 同时更新套餐对应菜品信息
     * 开启事物 保证同时成功
     *
     * @param setmealDto
     */
    @Override
    @Transactional
    public void updateWithFlavor(SetmealDto setmealDto) {
        // 更新 dish 表基本信息
        this.updateById(setmealDto);
        /*
            更新 套餐对应菜品表信息 setmeal_dish
                1.清理当前套餐对应的菜品数据 setmeal_dish - delete
                2.添加当前提交的菜品数据 setmeal_dish - insert
         */
        // 1.清理当前套餐对应的菜品数据 setmeal_dish - delete
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper1 = new LambdaQueryWrapper<>();
        lambdaQueryWrapper1.eq(SetmealDish::getSetmealId, setmealDto.getId());

        setmealDishService.remove(lambdaQueryWrapper1);

        //  2.添加当前提交的菜品数据 setmeal_dish - insert
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().peek((item) -> item.setSetmealId(setmealDto.getId())).toList();

        setmealDishService.saveBatch(setmealDishes);

    }
}
